The system prevents ice from forming in the engine air
inlet. The engine de-ice system is comprised of an engine hot
air de-icing valve, located on the engine, pilot and gunner ENG DE-ICE
switches and is protected by a 5 ampere ENG DE-ICE circuit breaker. The
system is energized from the 28 Vdc essential bus. The valve may be
controlled by either the gunner ENG DE-ICE switch, located on the gunner
miscellaneous panel, or the pilot engine control panel. The de-ice
system is normally energized to prevent the de-icing from activating. If
either switch is placed to the DE-ICE position, the circuit is broken
and the de-icing system is activated.